Respuesta :
Impersonal tone, Third-person point of view, and complex sentences.
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Answer:
Impersonal tone, third-person point of view and complex sentences
Explanation:
A formal tone in a text is determined mainly by the word choices and syntax. This text has a formal tone because an impersonal tone is used (The author does not use the first or the second point of view person to express, instead, they use the third-person point of view), the text is free from colloquialism, contractions, expression of subjective feelings and incomplete sentences, and, instead, it contains complex sentences such as "Other instruments, however, were once commonly used but have since become extremely rare."